[1] Microbiological Laboratory for Health Protection, National Institute of Public Health and the Environment, Bilthoven, Netherlands
[2] Laboratory for Pathology and Immunobiology, National Institute of Public Health and the Environment, Bilthoven, Netherlands
[3] Biomedical Health Sciences, Catholic University, Nijmegen, Netherlands
[4] Microbiological Laboratory for Health Protection, National Institute of Public Health and the Environment, PO Box 1, 3720 BA Bilthoven, Netherlands